--- a/src/move.c
+++ b/src/move.c
@@ -1356,7 +1356,10 @@ curs_columns(
 	    // don't skip more than necessary
 	    if (n > p_lines - curwin->w_height + 1)
 		n = p_lines - curwin->w_height + 1;
-	    curwin->w_skipcol = n * width2;
+	    if (n > 0)
+		curwin->w_skipcol = width1 + (n - 1) * width2;
+	    else
+		curwin->w_skipcol = 0;
 	}
 	else if (extra == 1)
 	{
@@ -1443,7 +1446,6 @@ textpos2screenpos(
 {
     colnr_T	scol = 0, ccol = 0, ecol = 0;
     int		row = 0;
-    int		rowoff = 0;
     colnr_T	coloff = 0;
 
     if (pos->lnum >= wp->w_topline && pos->lnum <= wp->w_botline)
@@ -1456,7 +1458,10 @@ textpos2screenpos(
 
 	is_folded = hasFoldingWin(wp, lnum, &lnum, NULL, TRUE, NULL);
 #endif
-	row = plines_m_win(wp, wp->w_topline, lnum - 1) + 1;
+	row = plines_m_win(wp, wp->w_topline, lnum - 1, FALSE) + 1;
+	// "row" should be the screen line where line "lnum" begins, which can
+	// be negative if "lnum" is "w_topline" and "w_skipcol" is non-zero.
+	row = adjust_plines_for_skipcol(wp, row);
 
 #ifdef FEAT_DIFF
 	// Add filler lines above this buffer line.
@@ -1481,32 +1486,30 @@ textpos2screenpos(
 	    col += off;
 	    width = wp->w_width - off + win_col_off2(wp);
 
-	    if (lnum == wp->w_topline)
-		col -= wp->w_skipcol;
-
 	    // long line wrapping, adjust row
 	    if (wp->w_p_wrap
 		    && col >= (colnr_T)wp->w_width
 		    && width > 0)
 	    {
 		// use same formula as what is used in curs_columns()
-		rowoff = ((col - wp->w_width) / width + 1);
+		int rowoff = ((col - wp->w_width) / width + 1);
 		col -= rowoff * width;
+		row += rowoff;
 	    }
 	    col -= wp->w_leftcol;
 	    if (col >= wp->w_width)
 		col = -1;
-	    if (col >= 0 && row + rowoff <= wp->w_height)
+	    if (col >= 0 && row > 0 && row <= wp->w_height)
 	    {
 		coloff = col - scol + wp->w_wincol + 1;
 		row += W_WINROW(wp);
 	    }
 	    else
-		// character is left, right or below of the window
-		row = rowoff = scol = ccol = ecol = 0;
+		// character is out of the window
+		row = scol = ccol = ecol = 0;
 	}
     }
-    *rowp = row + rowoff;
+    *rowp = row;
     *scolp = scol + coloff;
     *ccolp = ccol + coloff;
     *ecolp = ecol + coloff;